Understanding Dual-Polar Group Functionalized COFs for Accelerating Li-Ion Transport and Dendrite-Free Deposition in Lithium Metal Anodes

查看全文 作　　者：Qi [1]An;Hong-en [1]Wang;Genfu [1]Zhao;Shimin [1]Wang;Lufu [1]Xu;Han [1,2]Wang;Yao [1]Fu;Hong [1]Guo

机构地区：[1]School of Materials and Energy,Yunnan University,No.2,Green Lake North Road,Kunming 650091,China;[2]College of Physics and Electronics Information,Yunnan Key Laboratory of Optoelectronic Information Technology,Yunnan Normal University,Kunming 650500,China

出　　处：《Energy & Environmental Materials》索引2023年第6卷第2期,共10页

基　　金：financial support provided by the National Natural Science Foundation of China(52064049);the Key National Natural Science Foundation of Yunnan Province(2018FA028 and 2019FY003023);International Joint Research Center for Advanced Energy Materials of Yunnan Province(202003AE140001);Key Laboratory of Solid State Ions for Green Energy of Yunnan University(2019);the Analysis and Measurements Center of Yunnan University for the sample testing service. 摘　　要：Lithium metal batteries(LMBs)have attracted wide attentions because of their high theoretical specific capacity and low electrochemical potential.However,the growth of lithium dendrites seriously affects the practical application of LMBs.Thus,the lithium-philic carbonyl and carboxy dualgroup-modified covalent organic framework(COF-COOH)is designed to coat the polypropylene(PP)separator(COF-COOH@PP separator),realizing the regulation of ion transport and uniform lithium deposition.The plentiful and negative charge sites in the COF-COOH can suppress the diffusion of the freely movable lithium salt anion by the electrostatic interaction.Density functional theory(DFT)calculations demonstrate that the COF-COOH possesses the function of anchoring anion and desolvation.Consequently,the Li^(+)transference number(0.7),ion conductivity(0.64 mS cm^(-1)),and desolvating of Li^(+)are obviously improved by using the COF-COOH@PP separator.The modified Li-Li symmetric battery delivers stable cycle for more than 1000 h and lower voltage hysteresis(0.02 V).This dendrite-free deposition strategy holds great promise for practical application of Li metal anodes. 关键词：covalent organic frameworks dendrite-free functionalized separator lithiophilicity groups

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Understanding Dual-Polar Group Functionalized COFs for Accelerating Li-Ion Transport and Dendrite-Free Deposition in Lithium Metal Anodes

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